Update docker.elastic.co/elasticsearch/elasticsearch Docker tag to v9.1.4 (#135741)

This PR contains the following updates:

| Package | Update | Change | |---|---|---| |
[docker.elastic.co/elasticsearch/elasticsearch](https://www.elastic.co/products/elasticsearch)
([source](https://redirect.github.com/elastic/elasticsearch)) | patch |
`9.1.3` -> `9.1.4` |

---

### Release Notes

<details> <summary>elastic/elasticsearch
(docker.elastic.co/elasticsearch/elasticsearch)</summary>

###
[`v9.1.4`](https://redirect.github.com/elastic/elasticsearch/releases/tag/v9.1.4):
Elasticsearch 9.1.4

[Compare
Source](https://redirect.github.com/elastic/elasticsearch/compare/v9.1.3...v9.1.4)

Downloads: https://elastic.co/downloads/elasticsearch Release notes:
https://www.elastic.co/docs/release-notes/elasticsearch#elasticsearch-9.1.4-release-notes

</details>

---

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docs/reference/search-connectors/api-tutorial.md

@@ -44,7 +44,7 @@ docker run -p 9200:9200 -d --name elasticsearch \
   -e "xpack.security.enabled=false" \
   -e "xpack.security.http.ssl.enabled=false" \
   -e "xpack.license.self_generated.type=trial" \
-  docker.elastic.co/elasticsearch/elasticsearch:9.1.3
+  docker.elastic.co/elasticsearch/elasticsearch:9.1.4
 ```
 
 ::::{warning}

x-pack/qa/repository-old-versions-compatibility/src/javaRestTest/resources/README.md

@@ -35,10 +35,10 @@ docker run -d --name es \
 -v ${SHARED_FOLDER}/data:/usr/share/elasticsearch/data \
 -v ${SHARED_FOLDER}/snapshots:/usr/share/elasticsearch/snapshots \
 --env "discovery.type=single-node" \
-docker.elastic.co/elasticsearch/elasticsearch:9.1.3
+docker.elastic.co/elasticsearch/elasticsearch:9.1.4
 
 // Version 6
-docker.elastic.co/elasticsearch/elasticsearch:9.1.3
+docker.elastic.co/elasticsearch/elasticsearch:9.1.4
 ```
 
 ### Create Index Version 5